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Franchise arrangements - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Franchise Arrangements [Line Items]
Property and equipment, net	$ 743,533	$ 796,532
Property and Equipment Under Franchise Arrangements
Franchise Arrangements [Line Items]
Property and equipment, net	88,568	92,354
Land	$ 22,784	$ 24,661
Initial Franchise Fee
Franchise Arrangements [Line Items]
Finite-lived intangible asset, useful life	20 years

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Franchise Arrangements [Line Items]

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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